Thank you. But you can surf the net on your cell phone, no?We can only answer one question per thread, so I'll answer #1:
'On' or 'with' would be OK, but, unless you need to emphasise your computer as opposed to someone else's, it's not necessary to say 'on/with my computer', as it's obvious. You can't surf the net without a computer.
You'll need to ask #2 in a separate thread.
OK. I got it. Thank you!Yes, you can. I think you could say "with my computer" to emphasize that you don't like to surf it on your phone. heypresto's basic point is still correct: you don't have to say it unless you want to create a contrast with some other way of surfing the net.